You think it is a GM truck underneath? Dude, seriously?
It has a GM engine and transmission. That is it for the GM parts. Is the frame GM? No, it is a custom frame. Is the suspension GM? No, it is a custom suspension with remote reservoir shocks. Are the axles GM? No, they are Dana axles. Is the floorpan GM? No, it is custom-built.
As for the price, if you think you can get a hand-built, custom vehicle, built with with top of the line parts (heck, èven the knobs on the dash are machined from billet) for $60k then you are completely out of your mind. There is no plastic crap anywhere on an Icon.
It would be reasonable to say that you would rather buy a Wrangler Rubicon and put $20k into it. But to assert that you could build an Icon for $60k is flat-out BS.
If you simply bought all new stock parts for a FJ40- no upgrades like remote reservoir shocks - it would cost you more than $60k in parts, and you would still have to pay thousands for labor.